P4SMA33C Equivalent & Substitute Parts

Part Overview

The P4SMA33C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 28.2V reverse standoff voltage with a 47.99V maximum clamping voltage and 9A peak pulse current capability in a DO-214AC (SMA) package.

The P4SMA33C is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, enabling continued system design and procurement without redesign requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	28.2	V
Voltage - Breakdown (Min)	29.83	V
Voltage - Clamping (Max) @ Ipp	47.99	V
Current - Peak Pulse (10/1000µs)	9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitute parts for the P4SMA33C are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 28.2V
Voltage - Clamping (Max) @ Ipp: 45.7V to 47.99V range
Current - Peak Pulse (10/1000µs): 9A
Power - Peak Pulse: 400W
Package / Case: DO-214AC or SMA variants
Mounting Type: Surface Mount
Type: Zener, Bidirectional, Single Channel

The substitute parts P4SMA33CA and SMAJP4KE33CA-TP maintain these core electrical specifications and package compatibility, allowing direct functional replacement in circuit applications designed for the P4SMA33C.

Parameter Comparison

Parameter	P4SMA33C (Main)	P4SMA33CA (Sub 1)	SMAJP4KE33CA-TP (Sub 2)
Manufacturer	Littelfuse Inc.	Eaton - Electronics Division	Micro Commercial Co
Product Status	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	28.2V	28.2V	28.2V
Voltage - Breakdown (Min)	29.83V	31.4V	31.4V
Voltage - Clamping (Max) @ Ipp	47.99V	45.7V	45.7V
Current - Peak Pulse (10/1000µs)	9A	9A	9A
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-65 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMAJ
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	RoHS Compliant	REACH Unaffected

Engineering Selection Recommendations

P4SMA33CA (Eaton - Electronics Division): This substitute is recommended as the primary alternative to the obsolete P4SMA33C. The P4SMA33CA maintains identical reverse standoff voltage (28.2V) and peak pulse current (9A) specifications. The clamping voltage is 45.7V, which is within the functional range of the original part. The component is in active production status with RoHS compliance certification. Operating temperature range is -55 to 150°C, which covers most industrial and commercial applications. Packaging is available in Tape & Reel format, supporting high-volume manufacturing workflows.

SMAJP4KE33CA-TP (Micro Commercial Co): This substitute provides equivalent electrical performance with identical reverse standoff voltage (28.2V) and peak pulse current (9A). The clamping voltage is 45.7V, matching the P4SMA33CA specification. This component offers an extended operating temperature range of -55 to 175°C, suitable for high-temperature applications. The part is in active production status. Package designation is DO-214AC (SMAJ), which is mechanically compatible with standard SMA footprints. REACH compliance status is unaffected.

Both substitutes are suitable for direct replacement in applications where the P4SMA33C was originally specified, provided that the clamping voltage tolerance (45.7V versus 47.99V) is acceptable for the circuit design.

Frequently Asked Questions (FAQ)

Q: Can P4SMA33CA and SMAJP4KE33CA-TP be used interchangeably with P4SMA33C?

A: Both substitutes maintain the critical electrical parameters: 28.2V reverse standoff voltage, 9A peak pulse current, and 400W peak pulse power. The clamping voltage differs slightly (45.7V versus 47.99V), which is within acceptable tolerance for most TVS diode applications. Both are surface-mount components in DO-214AC/SMA package families and are mechanically compatible with P4SMA33C PCB footprints.

Q: What is the difference between P4SMA33CA and SMAJP4KE33CA-TP?

A: Both parts share identical electrical specifications (28.2V standoff, 45.7V clamping, 9A peak pulse). The primary differences are manufacturer (Eaton versus Micro Commercial Co), operating temperature range (P4SMA33CA: -55 to 150°C; SMAJP4KE33CA-TP: -55 to 175°C), and packaging format (Tape & Reel versus Bulk). Selection depends on temperature requirements and procurement preferences.

Q: Are there package compatibility concerns?

A: P4SMA33CA uses standard SMA package designation, while SMAJP4KE33CA-TP uses SMAJ designation. Both are DO-214AC variants and are mechanically compatible with standard SMA PCB footprints. No redesign is required for either substitute.

Q: What compliance certifications apply to these substitutes?

A: P4SMA33CA is RoHS Compliant. SMAJP4KE33CA-TP has REACH Unaffected status. Both parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080. Verify compliance requirements for your specific application and region.

Q: Why is the P4SMA33C obsolete?

A: The P4SMA33C is no longer in active production. The substitute parts P4SMA33CA and SMAJP4KE33CA-TP are actively manufactured alternatives that provide equivalent functionality and are recommended for new designs and ongoing procurement.

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